lfn
serial
ticket/834-toolchain-update
topic/msim-upgrade
topic/simplify-dev-export
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Last change
on this file since e7c42ac0 was 2b4a9f26, checked in by Martin Decky <martin@…>, 15 years ago |
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Add interrupts-disabled spinlocks whose purpose is the semantic distinction between spinlocks acquired always with interrupts disabled and normal spinlocks.
The compile-time distinction is implemented by the means of the type system and basic code correctness properties can be checked by the debugging assertions during run-time (with CONFIG_DEBUG)
- Correct bracketing of top-level interrupts-disabled spinlocks
- Correctness of the use of nested interrupts-disabled spinlocks (interrupts must be actually disabled)
- Basic consistency of places where the interrupt level is restored
The API encapsulates the physical manipulation with the interrupt levels and also two common locking patterns
- Sequential unlocking of spinlock A before locking of spinlock B without restoring original interrupt level (irq_spinlock_pass())
- Hand-over-hand locking of two locks in the correct locking order, e.g. if A precedes B, then locking of B before unlocking A (irq_spinlock_exchange())
A new HAL function interrupts_disabled() should be implemented in each port to support the run-time checks of correctly disabled interrupts while locking nested interrupts-disabled spinlocks
(only in debug builds, not used in non-debug builds).
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Property mode
set to
100644
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File size:
2.1 KB
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| 1 |
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| 2 | SPINNING LOCKS
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| 3 | spinlock_lock, spinlock_trylock, spinlock_unlock
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| 4 | +------------+
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| 5 | | spinlock_t |
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| 6 | +------------+
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| 7 | |
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| 8 | +------------------------------+
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| 9 | |
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| 10 | INTERRUPTS-DISABLED SPINNING LOCKS |
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| 11 | irq_spinlock_lock, irq_spinlock_trylock, irq_spinlock_unlock |
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| 12 | +----------------+ |
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| 13 | | irq_spinlock_t |<--------------------+
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| 14 | +----------------+
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| 15 |
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| 16 |
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| 17 |
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| 18 | WAIT QUEUES
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| 19 | waitq_sleep_timeout, waitq_wakeup
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| 20 | +---------+
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| 21 | | waitq_t |
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| 22 | +---------+
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| 23 | / \
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| 24 | SEMAPHORES / \ CONDITION VARIABLES
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| 25 | semaphore_down_timeout, semaphore_up condvar_wait_timeout, condvar_signal
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| 26 | +--------------+ / \ +-----------+
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| 27 | | semaphore_t |<-+ +->| condvar_t |
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| 28 | +--------------+ +-----------+
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| 29 | | ^
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| 30 | | |
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| 31 | | +------+
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| 32 | V /
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| 33 | MUTEXES / READERS/WRITERS LOCKS
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| 34 | mutex_lock_timeout, mutex_unlock rwlock_reader/writer_lock_timeout, rwlock_unlock
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| 35 | +---------+ / +----------+
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| 36 | | mutex_t |------------------------------->| rwlock_t |
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| 37 | +---------+ / +----------+
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| 38 | | /
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| 39 | +------------------------+
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